Artificial tooth.



J. W. IVORY.

ARTIFICIAL TOOTH.

APPLIOATION FILED AUG. 22, 190B.

Patented Feb. 2, 1909.

Witmmooo JAMES W. IVORY, PHILADELPHIA, PENNSYLVANIA.

ARTIFICIAL TOOTH. 0

Specification of Letters Patent.

Patented Feb. 2, 1909.

Application filed August 22, 1908. Serial No. 449,813.

To all whom it may concern:

Be it known that I, JAMES V8. IVORY, a subject of the King of GreatBritain, residing in the city and county of Philadelphia,

State of Pennsylvania, have invented a new and useful Artificial Tooth,of which the following is a specification.

This invention relates to the setting of artificial teeth and has for anobject to securely anchor such teeth in the supporting plate in a mannerto insure the same against displacement in any direction.

It is well known that owing to the small available surface for fasteningartificial teeth to a plate, that the means employed at present givevery unsatisfactory results, and the teeth become loosened or displaced.By my novel meansan interlocking is secured between each tooth and aplate, which advantageously cooperates with a sufficient portion of theplate surface to make possible a permanent fastening for each tooth andprevents displacement in any direction.

It further consists of other novel features of construction, all as willbe hereinafter fully set forth. V

For the purpose of illustrating my invention, I have shown in theaccompanying drawings a general form thereof which is at presentpreferred by me, since the same has been found'in practice to givesatisfactory and reliable results, although it is to be understood thatthe various instrumentalities of which my invention consists can bevariously arranged and organized and that my invention is not limited tothe precise arrangement and organization of these instrumentalities asherein shown and described. a V

Figure 1 represents a plan of a tooth embodying my invention. Fig. 2represents a side elevation of the same. Fig. 3 represents a section online mw, Fig. 1. Fig. 4- represents a plan of the same. Fig. 5represents a section on line yg Fig. 4. Fig. 6 represents a sideelevation of a tooth embodying a modification of my invention. Fig. 7represents a plan ofan incisor tooth embodying a modification of myinvention. Fig. 8 represents a section of the same on line z-z,aFig. 7.Fig. 9 represents a side I nodule projection 5.

portion of a plate with the teeth in position.

Fig. 11 represents a rear view of an incisor tooth;

Similar numerals of reference indicate corresponding parts in thefigures.

Referring to thedrawings:1 designates the body portion of an artificialtooth embodying my invention the same being hollow for the reception ofthe material which forms the plate for the artificial denture. Theinterior of said portion 1 of the tooth .is provided with inclined sides2 converging to the bottom 3, which latter is provided with a suitablyshaped depression 4, serving the purpose of an anchorage for the platematerial. a j

5 designates. the projecting nodular portion formed integral with thebody portion 1 of the tooth and of the same material, the

. function of which is to act as an interlocking means for holding thetooth securely in the plate and is adapted to be embedded in thematerlal of the plate itself. The projecting nodular portion 5, in thepresent instance, is cup shaped and hollowed out to provide for thereception of the plate material, and in addition has a nick 6 into whichthe plate material enters to prevent lateral displacement.

7 designates a converging dovetail on both sides of the projection 5 ata point where the body and nodule join. The body 1 has interior slopingsides to a groove forming a.

communication between the hollow portion of the nodule projection 5 andthe interior of the tooth proper joining with grooves in the body of theporcelain leading into the converging dovetail slots in the sides of theSide extensions 8 are formed on the nodule projection 5, and extendlaterally from the neck 7 in order to provide strength to the nodule anddepth to the-wall as a retention for rubber within this noduleprojectipn. As a further securing means apertures 9 may be formed in thesides of the body to allow the plate material to be forced therein.

10 designates a recessed portion of one of the sides 2, whereby anoverhanging lip is provided as fastening means, preventing verticaldisplacement of the tooth. It will elevation of the same. Fig. 10represents at be noted that the nodule projection 5 extends rearwardlyfrom the lingual side of the artificial tooth and is inclined relativethereto, whereby the lower part of the tooth is substantially cupshaped, forming a depression from the anterior to the distal sides, thusproviding a saddle for the alveolar ridge.

The upper surface of the projection 5 is substantially continuous withthe biting or incisive edge or grinding surface of the tooth and slantsoff to the palatal ridge of the mouth. Of course it will be understoodthat for the different teeth a somewhat different pitch will necessarilyhave to be given to the projection 5 in order that it will corre'ctlyassume a position relative to the cooperating ridge of the mouth.

The projecting nodular portion 5 is somewhat half spherical on itsexterior surface forming a converging face or an inclined outer surfacearound which the plate material flows in an interlocking manner, thistogether with the notch 6 and converging grooves 7 help to hold thetooth firmly embedded in the plate material.

It will be apparent that when the artificial teeth have been set in theplate 11, as shown in Fig. 10, that the lateral grooves formed by theside extensions 8 securely retain the teeth in position while theirregular shaped interior of the tooth with all portions of which thechannel in the converging dovetail grooves on either side of theprojecting nodular communicates with the channel in the body and forms asubstantial and permanent setting for the teeth. As a further securingmeans, the portion 10 is well adapted to prevent vertical movement andthe entire tooth is securely interlocked with the plate.

It will now be apparent that I have devised a novel and usefulconstruction which embodies the features of advantage enumerated asdesirable in the statement of the invention and the above descriptionand while I have in the present instance shown and described thepreferred embodiment thereof which has been found in practice to givesatisfactory and reliable results, it is to be understood that the sameis susceptible of modification in various particulars without departingfrom the spirit or scope of the invention or sacrificing any of itsadvantages.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. In a tooth, a body portion a neck, and a cup-shaped nodularprojection integral therewith facing the concavity of the toothcooperating with a plate to prevent displacement of said body portion.

2. In a tooth, a body portion a neck, and a nodular projection integraltherewith said projection being cup shaped and having side extensionsthereon to prevent displacement of said body portion.

In a tooth, abody portion, a neck extending rearwardly from the innerside of the tooth, a projection integral therewith and means on saidprojection cooperating with the plate to prevent displacement of saidbody portion.

at. In a tooth, a body portion, a nodular projection integral therewithbeing cup shaped and having a nick to prevent displacement of said bodyportion.

5. In a tooth, a body portion, inclined sides therein, a bottom thereforhaving a recess and an integral cup-shaped nodular projection extendingtherefrom with inclined sides and recess to form a locking means for thetooth with av plate.

(3. In a tooth, a body portion, a 'nojection integral therewith andprojecting rearwardly from the inner side of the tootl'i, sideextensions on said projection forming a neck, and grooves in said neckcooperating with said body portion to interlock said body portion with aplate.

7. In a tooth, a body portion, a projection integral therewith andprojecting rearwardly from the inner side of the tooth, side extensionson said projection forming a neck, and grooves in said neckcooperatingwith said body portion to interlock said body portion with aplate.

8. In a tooth, a body portion, and an integral nodular projection havingan inclined outer face and a. hollow internal portion facing theconcavity of the tooth.

9. In a tooth, a body portion, an integral nodular projection having aninclined outer face, a hollow internal portion, and converging dovetailson the sides of the face.

JAMES IV. IVORY.

I'Vitnesses C. D. MoVAY, F. A. NEWTON.

